Air nozzles

ABSTRACT

The invention relates to an air nozzle which is self-regulating in that it utilizes a spring-biased castellated piston within the nozzle in the direct flow of air to cut off the air escaping from the nozzle when the pressure exerted against the piston exceeds a predetermined value.

D United States Patent [151 3,674,214

Brown 1 July 4, 1972 [54] AIR NOZZLES 1,001,510 8/1911 Curbey ..137/517 [72] Inventor: Lowell N. Brown, 11612 Bowling Green 3490699 1,1970 Murray X Drive St Louis Mo 6314} 2,942,791 6/1960 Bush et a1... .....239/526X 2,768,678 10/1956 Schwank ..239/569 X [22] Filed: Aug. 24, 1970 2,883,117 4/1959 Nelson ..239/459 [21] APPI'NO': 66347 Primary ExaminerM. Henson Wood,Jr.

Assistant Examiner-Thomas C. Culp, Jr. [52] US. Cl ...239/S26, 239/459, 239/569 Attorney-Joseph A. Fenlon, Jr. [51] Int. Cl ..B05b 7/02 [58] Field of Search ..239/569, 570, 526, 459, 571, [57] ABSTRACT 239/572 583; 37/517 The invention relates to an air nozzle which is self-regulating in that it utilizes a spring-biased castellated piston within the [56] References Cited nozzle in the direct flow of air to cut off the air escaping from UNITED STATES PATENTS the nozzle when the pressure exerted against the piston ex- I ceeds a predetermined value. 337,236 3/1886 Briscoe ..137/517 934,286 9/1909 Cole ..137/517 3 Claims, 3 Drawing, Figures PA'TE'NTEDJUL I972 3,674,214

FIG. 3 INVENTOR LOWELL N BROWN ATTY AIR NOZZLES To prevent employee injuries, safety regulations have recently been promulgated which limit the amount of pressure at the discharge port of an air gun. Since most compressors operate at a pressure which exceeds greatly the new regulation, there is an immediate need for a simple and efficient means of regulating the discharge pressure of an air gun.

It is the object of this invention to provide such a simple and efiicient means.

With the above and other objects in view, which will become immediately apparent upon reading the specifications, my invention resides in the unique and novel form, arrangement, construction and combination of parts shown in the drawings, explained in the specifications, and claimed in the claims.

IN THE DRAWINGS FIG. 1 is a side elevational view of an air gun which employs a nozzle embodying the principles of my invention;

FIG. 2 is an enlarged fragmentary sectional view taken along lines 22 of FIG. 1; and

FIG. 3 is an exploded view of the noule and its components.

CONSTRUCTION Referring now in more detail and by reference character to the Drawings, which illustrate a preferred embodiment of my invention, A designates a nozzle which is threadedly attached to a conventional air gun B. The gun B is conventional and is provided with a main body in which is mounted a normally closed trigger valve 12 and a hose attachment fitting 14 conventionally suited for attaching the gun B to a pneumatic supply hose (not shown). In the conventional manner, the outlet 16 of the gun B is also externally threaded for attachment of a nozzle, and is provided with an outlet port 18 through which air under pressure is ejected when the trigger valve 12 is actuated.

The nozzle A comprises four basic components: a shell 20, a spring 22, a plunger 24, and an O-ring 26. The shell 20 is preferably though not necessarily cylindrical in external configuration and includes an outlet bore 28, a diametrally larger intermediate bore sized for accepting the spring 22, and a much larger threaded bore 32 adapted for removably attaching the nozzle A to the outlet 16 of the gun B. Intermediate the bores 30 and 32, the shell 20 is provided with a smooth, conically-shaped annular shoulder 34, and intermediate the bores 28 and 30, the shell 20 is provided with an annular shoulder 36.

The plunger 24 comprises an elongated shank 38 which is sized slightly smaller in diameter than the outlet bore 28 for free movement therein, an intermediate diametrally reduced neck 40, a diametrally larger spring retaining element 42, a smooth conical section 44, an O-ring seat 46, and a castellated piston 48.

ASSEMBLY The nozzle A is assembled by placing the O-ring 26 in the seat 46 and the spring 22 in the bore 30 with one end of said spring abutting the shoulder 36. Thereafter the shank 38 is passed through the center of the shell 20 and the spring 22 and out the forward end of the nozzle A. With the components in such position, the nozzle A is threaded onto the outlet end 16 ofthegunB.

OPERATION The components of the nozzle A are normally in the position shown in FIG. 2 with the spring 22 biasing the castellations of the piston 48 against the outlet end 16 of the gun B. In this position the castellations provide sufficient separation to permit the air from the outlet port 18 to be thrust against the piston 48 as the trigger valve 12 is actuated. As the pressure of the air coming through the outlet port 18 increases, the

lunger 24 is moved outwardly compressin the spring 22. e spring 22 has been preselected to be suc that when the pressure of the air coming out of the gun B slightly exceeds the maximum desired limit, the spring 22 will be fully compressed and the periphery of the O-ring 26 will engage the conical shoulder 34, thereby cutting off the flow of air through the shell 20. As the pressure is reduced the flow will resume.

It should be understood that changes and modifications in the form, construction, arrangement, combination of various parts of my invention herein shown may be made and substituted without departing from the nature and principle of my invention.

Having thus described my invention what I claim and desire to secure by Letters Patent is recited in the specifications, shown in the drawings and claimed in the claims.

1. A regulated nozzle for a pneumatic blow gun which includes a threaded nozzle attachment end and a discharge port centrally located in said attachment. end and adapted for discharging air under pressure into said nozzle upon actuation of a triggering means, said nozzle comprising a cylindrical shell provided with three continuous coaxial bores, the first bore being the smallest in diametral size and being located at the outer end of the nozzle, the second bore being of inter mediate diametral size and being centrally located in the shell, the third bore being the largest and being threaded for attachment to the nozzle attachment end of the air gun; said shell also including a first annular shoulder between the first and second bores and a'second annular shoulder between the second and third bores; a piston comprising an elongated cylindrical stem and an annular base, said piston being loosely disposed in the shell with the outer end of the stem projecting outwardly through the end of the nozzle and being adapted for movement within the nozzle along the common axis of the three bores; a cylindrical spring disposed about the stem of the piston in the second bore, one end of the spring being in abutment with the first annular shoulder and the other end of the spring being in abutment with the base of the piston at the stern whereby normally to bias the base of the piston away from the first bore and against the discharge port, the spring constant of the spring being such that when the pressure of the air discharge from the discharge port exceeds a predetermined value the piston will have moved outwardly in the third bore and be pressed against the second annular shoulder, and O- ring means mounted on the base of the piston for compressed disposition between the second annular shoulder and the base of the piston when the, pressure at the discharge port exceeds said predetermined value.

2. The nozzle of claim 1, wherein the second annular shoulder is beveled.

3. The nozzle of claim 1, wherein the face of the piston presented to the discharge port is castellated. 

1. A regulated nozzle for a pneumatic blow gun which includes a threaded nozzle attachment end and a discharge port centrally located in said attachment end and adapted for discharging air under pressure into said nozzle upon actuation of a triggering means, said nozzle comprising a cylindrical shell provided with three continuous coaxial bores, the first bore being the smallest in diametral size and being located at the outer end of the nozzle, the second bore being of intermediate diametral size and being centrally located in the shell, the third bore being the largest and being threaded for attachment to the nozzle attachment end of the air gun; said shell also including a first annular shoulder between the first and second bores and a second annular shoulder between the second and third bores; a piston comprising an elongated cylindrical stem and an annular base, said piston being loosely disposed in the shell with the outer end of the stem projecting outwardly through the end of the nozzle and being adapted for movement within the nozzle along the common axis of the three bores; a cylindrical spring disposed about the stem of the piston in the second bore, one end of the spring being in abutment with the first annular shoulder and the other end of the spring being in abutment with the base of the piston at the stem whereby normally to bias the base of the piston away from the first bore and against the discharge port, the spring constant of the spring being such that when the pressure of the air discharge from the discharge port exceeds a predetermined value the piston will have moved outwardly in the third bore and be pressed against the second annular shoulder, and O-ring means mounted on the base of the piston for compressed disposition between the second annular shoulder and the base of the piston when the pressure at the discharge port exceeds said predetermined value.
 2. The nozzle of claim 1, wherein the second annular shoulder is beveled.
 3. The nozzle of claim 1, wherein the face of the piston presented to the discharge port is castellated. 